Can opener



FIG. 1 is a top perspective view of a can opener showing our new design;

FIG. 2 is a rear view;

FIG. 3 is a front view;

FIG. 4 is a top view;

FIG. 5 is a bottom view;

FIG. 6 is a left side view; and,

FIG. 7 is a right side view.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for an can opener, as shown and described. 